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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [hsw DP] Ubuntu 12.04 unable to use external monitor through edock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73694#c22">Comment # 22</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [hsw DP] Ubuntu 12.04 unable to use external monitor through edock"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73694">bug 73694</a>
from <span class="vcard"><a class="email" href="mailto:tobs76@trashmail.de" title="tobs76@trashmail.de">tobs76@trashmail.de</a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=73694#c2">comment #2</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=92231" name="attach_92231" title="reverse dp link params selection">attachment 92231</a> <a href="attachment.cgi?id=92231&action=edit" title="reverse dp link params selection">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=73694&attachment=92231'>[review]</a> [review]
> reverse dp link params selection
>
> Please test the attached patch. If it doesn't work out please boot with
> drm.debug=0xe and attach the complete dmesg.</span >
Hello Daniel Vetter,
sorry, but your patch makes things worse.
With kernel 3.15.7 (that includes your patch), I get lots of these messages
when I do Alt-F1 to switch from X to console. The monitor connected via display
port stays black:
[ 1775.967734] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[ 1776.016555] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.031180] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.045291] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.059590] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.074084] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.088169] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.102208] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.103948] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[ 1776.532617] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.546898] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.560964] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.575010] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.589319] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.603417] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.617493] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.619235] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
[ 1776.669307] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.683639] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.697915] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.711962] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.726033] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.740120] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.754225] [drm:intel_dp_start_link_train] *ERROR* too many voltage
retries, give up
[ 1776.756172] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP,
aborting
With kernel 3.13.0, I get only one batch of these messages, but the monitor was
working correctly.
My setup is:
Ubuntu trusty 14.04
Intel on board graphic
One monitor via display port, one monitor via analog VGA connector (15pin).
I tried the new kernel to debug another problem and stumbled upon this issue.
I suggest you revert your patch on upcoming linux or make it configurable.
Best regards,
Tobias</pre>
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